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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Comparison of SuperDARN peak electron density estimates based on elevation angle measurements to ionosonde and incoherent scatter radar measurements

Fig. 5

Line plots of the F region peak electron density \( N_{\text{m}} F2 \) averaged in four time sectors (a night: \( 0 \pm 3\,\text{LT} \); b dawn: \( 6 \pm 3\,\text{LT} \); c noon \( 12 \pm 3\,\text{LT} \); d dusk \( 18 \pm 3\,\text{LT} \)) according to Rankin Inlet radar elevation measurements, red and blue lines. Red lines show \( N_{\text{m}} F2 \) estimates based on all radars records while blue lines represent \( N_{\text{m}} F2 \) estimates for limited data sets with discarded measurements for which the antennae cross-phase deviation from its maximum possible value \( \varPsi_{{\text{adj}}} \) (Ponomarenko et al. 2018) was above value \( 250^\circ \). Radar data at all operating frequencies were considered. Grey lines are CADI-based data on \( N_{\text{m}} F2 \), averaged over the same local time intervals. Shown by numbers are the correlation coefficients between the radar and CADI curves. Lines for each instrument were obtained by applying \( \pm \) 30-day boxcar sliding filter

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